★Rails Turtorial：ログイン時の挙動についてまとめ

[yuyanegishi]

user.activated?について

• レコード.カラム?をすると、そのレコードのカラムに値が入っていればtrueを、nillであればfalseを返す

  
  user = User.find_by(email: "example@railstutorial.org") 
  => #<User id: 1, name: "Example User", email: "example@railstutorial.org", created_at: "2018-11-22 01:14:16", updated_at: "2018-11-22 01:14:16", password_digest: "$2a$10$V2dr6oBhIMNNoQHjpj82EO9TBCMoiZz8a9oDKrLTB7o...", remember_digest: nil, admin: true, activation_digest: "$2a$10$gyfsdTN05JAwVft13tnJ2eFuKyODY5k.vydgyiTHb2J...", activated: true, activated_at: "2018-11-22 01:14:16", reset_digest: nil, reset_sent_at: nil>

user.activated? => true

user.name? => true

user.reset_digest? => false

user.reset_sent_at? => false

### 三項演算子について
* 「式　？　真だった場合の処理　：　偽だった場合の処理」でif文を書き換えることもできる

### remember(user)について
* session_helper.rb
```ruby
def remember(user)
      user.remember
      cookies.permanent.signed[:user_id] = user.id
      cookies.permanent[:remember_token] = user.remember_token
end

• user.rb（モデル内のファイル）

  def remember
  self.remember_token = User.new_token
  update_attribute(:remember_digest, User.digest(remember_token))
  end

  def User.new_token
  SecureRandom.urlsafe_base64
  end

  
  Updates a single attribute and saves the record. This is especially useful for boolean flags on existing records. Also note that

• Validation is skipped.

• Callbacks are invoked.

• updated_at/updated_on column is updated if that column is available.

• Updates all the attributes that are dirty in this object.

This method raises an ActiveRecord::ActiveRecordError if the attribute is marked as readonly.

Also see update_column.